Regensburg 2010 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 26: Poster Session
MM 26.45: Poster
Dienstag, 23. März 2010, 14:45–16:30, Poster C
Seed induced nucleation in colloidal model systems under microgravity — •Patrick Wette1 and Hans Joachim Schöpe2 — 1Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51170 Köln — 2Johannes Gutenberg-Universität Mainz, Institut für Physik, Staudinger Weg 7, 55099 Mainz
Understanding the process that drives an under cooled fluid to the crystal state is still a challenging issue for condensed matter physics and plays a key role designing new materials. Crystallization undergoes crystal nucleation, growth and ripening. The crystallization kinetics and the resulting polycrystalline morphology are given by a complex interplay of these mechanisms. A great deal of progress has been made in recent years using colloidal suspensions as model system studying crystallization. We here present systematic measurements of the crystallization kinetics of a charged colloidal model system adding small amounts of seeds using time resolved scattering techniques. Large seeds show strong sedimentation under gravity even on the timescale of the crystallization process. To avoid this problem we performed our measurements under micro gravity during parabolic flights. We report how the seeds size and structure affect crystal nucleation and growth as function of meta stability giving the possibility to modify the crystallization process.